fix #246

Author: SimonDanisch

src/GLVisualize.jl

@@ -22,7 +22,7 @@ using FreeTypeAbstraction
 import ColorVectorSpace
 import GLAbstraction: N0f8
 export N0f8 # reexport for examples/tests
-using Base.Iterators: filter
+
 import Base: merge, convert, show
 using Base.Iterators: Repeated, repeated
 

src/visualize/surface.jl

@@ -110,7 +110,7 @@ end
 
 
 function position_calc(x...)
-    _position_calc(filter(x->!isa(x, Void), x)...)
+    _position_calc(Iterators.filter(x->!isa(x, Void), x)...)
 end
 function glsllinspace(position::Grid, gi, index)
     "position.ref[$gi] + ($index - position.offset[$gi]) * position._step[$gi]"